Like the original idea, but the rotary tool brushes I ordered were slightly shorter, so using the default mounting, the brush wouldn't contact the model. I slotted the screw holes so that I could adjust it upward until it made appropriate contact. Yes, the slots are bigger than they needed to be. Was done quickly and in a pinch - if you slide it all the way down and fasten it to the bottom, making the entire print ram into your printhead, you should probably return your printer because you don't understand how it works :)
All jokes aside - adjust as necessary and snug it up - this design allows some variability on mounting height.
The author remixed this model.
Slotted screw tracks to allow for adjustment. Would still work with the stock baskets from the original design.